Radioactive decay of 40k atoms in an igneous
rock has resulted in a ratio of 25 percent 40k
atoms to 75 percent 40ar and 40ca atoms.
how many years old is this rock?
(1) 0.3 10^9 y (3) 2.6 10^9 y
(2) 1.3 10^9 y (4) 3.9 10^9 y

Slam, judaism, and christianity have shared historical origins. select the best answer from the choices provided. t f

What is the difference between the cultures of central asia and the caucasus region? the majority of people in central asia are muslim; the majority in the caucasus region are christian. the primary language in central asia is armenian; the primary language in the caucasus region is russian. central asia has been plagued by ethnic unrest; the caucasus region has had little ethnic conflict. the effects of soviet rule can still be seen in central asia; the caucasus region has developed its own identity since the fall of the ussr.

Abird flies at a speed of 75 metres per second for 15 seconds, how far does the bird fly